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                [POI2005]sam-Toy Cars                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p>Jasio 是一个三岁的小男孩,他最喜欢玩玩具了,他有n 个不同的玩具,它们都被放在了很高的架子上所以Jasio 拿不到它们. 为了让他的房间有足够的空间,在任何时刻地板上都不会有超过k 个玩具. 
Jasio 在地板上玩玩具. Jasio'的妈妈则在房间里陪他的儿子. 当Jasio 想玩地板上的其他玩具时,他会自己去拿,如果他想玩的玩具在架子上,他的妈妈则会帮他去拿,当她拿玩具的时候,顺便也会将一个地板上的玩具放上架子使得地板上有足够的空间.
他的妈妈很清楚自己的孩子所以他能够预料到Jasio 想玩些什么玩具. 所以她想尽量的使自己去架子上拿玩具的次数尽量的少,应该怎么安排放玩具的顺序呢?
</p><hr/><h3>输入格式</h3><p>第一行三个整数: n, k, p (1 <= k <= n <= 100.000, 1 <= p <= 500.000), 分别表示玩具的总数,地板上玩具的最多个数以及Jasio 他想玩玩具的序列的个数,接下来p行每行描述一个玩具编号表示Jasio 想玩的玩具.  
</p><hr/><h3>输出格式</h3><p>一个数表示Jasio 的妈妈最少要拿多少次玩具. 
</p><hr/><h3>样例输入</h3><pre>3 2 7
1
2
3
1
3
1
2
</pre><hr/><h3>样例输出</h3><pre>4
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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